Water-tube steam-boiler.



J. HOWDEN.

WATER TUBE STEAM BOILER iP'fLIGATION FILE!) NOV, 21, mos.

Patented July 1, 1913.

2 SHEETS-SHEET 1.

W SM m Ab J Attorney WLTNEZSSES;

J. HOWDEN.

WATER TUBE STEAM BOILER.

APPLKGATIO'N FILED NOV.27,1909.

Patented July 1, 1913.

2 SHEETS-*SHEET 2.

1NVENTOR, JA ES HOWDEN,

rti oYne-d Unison s'rstrss Fe rets? "@FEICE.

JAMES HownEN, or GLASGOW, SCOTLAND,

WATER-TUBE STEAM-BOILER Application filed Fevemlier 27, 1908; Serial No. 530,129.

To all who-m it ma y concern: 4

Be itlcnown that I, JAMES Hownsx, a subject of the King of the United Kingdom of Great- B-ritein and Ireland, and residingat Glasgow, Sootlandyhave invented a certain new ind useful Improvement in \Vaten TubeSteam-Boilers of which the following is a specification. r I

This invention relates to an improved water tube steam boiler 'ot the kind-comprising top drums'and bottom drums of semicircular or approximately semi circuforms ofcirculatingdevices located within,

fthe vertical tubes.

7 above the vlurnzices are connected to each other by a common feed water pipe G. This r I As shown, tlieboil'er comprises top drums A and bottom drums BfS Qlnl- ClrCtllflr- 0r aipproxur'uitely so in cross-section,-.withman-' hole doors zit-one end of each drum, through which access is obtained to the inside of the drums though the uppeizdrums mey i-vhenmore convenient on account of the posit-ion of surroundings have ainanhole on the top for access. it V- 0C are vertical water tubes connecting the two drums, through which the steam -cv21porutc ,l in the lower drum and in the tubes themselves passes into the upper drum. The tubes are of equal length, straight, Without bends, and thus interchangeable.

The Water line D of the boiler is in the top drums, the upper part,- of these drums being steam space. In boilers having several elements or principal parts, these steam spaces in the top drums are connected by preference to a common steam receiver E from which the steam to be uscdis taken. The bottom drums B' placed immediately pipe can also be used as a common bloywoll by means of separate valves tor-each opera tion, the feed valve being closed when the blow-off valve is opened, and vice verse.

The water in the upper drums also'has a common connection by. rner.ns of short pipes H preferably at the back of the drums. "lhe top drums A extended backward over the combustion chamber I, thus forming Specification of Letters Patent.

' PatentedJulyl,1913;

bridge steys a .4 The back'ends of therdr-ums' hiive projecting single pieces J or the like, with vertical flanges fixed to the ends of the drums; the lower flange resting on 2.- common horizontal Iron or steel boa-m K resting on and fixed to iron columns or standards I) preferablyflag; resting and fixed-on a common iron'tounda- The horizontal upper beam K.-

'tion plate.

pertof the effective heating surfaceof the" boiler, said top drums being provided with.

and-those vertical standiirds'are preferably of H section.

The lower drums B are supported on th i' front end by a strong vertical; plate Motifl:

ened by ajngle bars F on which'the'seseveriil.

drums rest. This plate is cerried ilown. to

a stro'ng angle-zit the bottom across 'the' whole front of the boiler, The plit ejM htas'fi suitable'opeliings for the fiinnnce end zishp it" doors. llast-jron air boxes replaced? ili'- side the furnace door open1'n-gsf,- carryingfn protection of brickwork above foiftheicoin mon feedand blowofi" pipe,- the:f ron''cm y 4 action of the fire.

plate being also protected from the p Inside the lower drums ntthelfrontfhretdiaphragm plates N which cause the ir orit f tubes to act as .downcomers,- and also insure the collection of any sediment-,flm)

that such sediment does not reachthe bot;

tom ot the drum above the fire but is deposited in the front ends of the drums and blown out through the blow-oil valve.

drums so that. much less is requiredto'bo done by the tubes than inthe usual forms of water tube boilers, where all ornearly all the evaporation takes place in the tubes In this form of boiler a la'rgproportion of the evaporation isetlectedfby the lower:

themselves greatly lesseningft-heir durability and ,efiiciency by their being subject to the direct heat of the flfllililCB. This feature reduces greatly the injurious'uct-ion of the heat of the flameon theti bes and consequently renders them much .more durable,

and when the boiler is properly worked, the

tubes last for many years-without requiring renewal.

' The method of removing and replacing the tubes with the boiler inposition is as follows: The tubes arecut in the usual manner from the interior of the drums by a tube cutter, and ferrule filling up an enlarged.

hole in-one of the drums, say the loweronc, is also cutout at the same time. Should the tube to be rj ofzed be in the interior of the stack of tub the tubes nearestto the outside in the ro are, also removed in a like manner and drawn up through the space 0 or taken out. at 'the side doors if they are in the side elements and nearer to these doors. By this method of removing and replacing the tubes, all the costly and objectionable doors on the top of the drums A which are used in other forms of water tube boilers of this kind may be entirely dispensed with.

On the outer sides of the boiler it is preferred to have doors X which can be opened and shut easily for examining the tubes, such doors-comprising sheet iron cases containing a non-conducting substance and being also protected by linings Y of non-conducting material.

The passage of the hot gases through the spaces between the several elements is impeded by means of partitions Z as shown in Fig. 3. ,The boiler is also arranged so that the tubes can be cleaned and scraped by steel scrapers put in edgewise from the front and turned on the flat and then "passed up and down the outside surfaces of the ,tubes. These scrapers can be actuated from the front smoke-box and combustion chamber When the boiler is cold. The boiler com prises four elements or principal parts but can be made of more elements if required, with a common furnace, or it may be made with a separate furnace for each element, with division walls It between the furnaces, as shown in the drawings.

As shown, the water tubes C are fitted with spiral circulating strips C, which, as

form, each of said strips being composed of two or more lengths orsectionsjointed together as by wire lacing 0' passed through small holes punched in the end parts of the sections so that the sections may be folded on each other or so inclined in relation to each other that the spiral circulating strip may be passed into the top drum A of the boiler through the usual man-hole opening a" and unfolded as it is entered into any one of the water tubes C as indicated at Fig. 1 so as to form a continuous spiral.

The strip C when fitted in the water tube C may be suspended by a cross pin 0 or in any other usual way.

As shown-in Fig.5, the sections or lengths of the strip C are formed by cutting cross slits in a long strip so'as to leave a connecting web portion a whirl-1, while retaining the strip in a single piece, permits the sections to be readily folded on or inclined in relation to each other.

. Having now described my invention what I claim and desire to secure by Letters Patent of the United States is In a water tube steam boiler, in combination, a top drum and a bottom drum,'the said bottom drum overlying the furnace grate, the front part of said bottom drum being protected from the furnace gases, upright rows of straight Water tubes connecting the top and bottom'drums, the front. rows of tubes serving as downcomers, and rearwardly inclined baffle plates disposed in the bottom drum in the vicinityofthe downcomers, said battle plates being adapted to prevent passage of steam from the rear part name to this specification in the presence of regards their contour may be of the usual 3 two subscribing witnesses. g

\ Y JAMES HOWDEN.

Witnesses:

J NO. ARMSTRONG, Sr;, JOHN MCGLEARY, Jr. 

